Actually I did not find any difference between two wheels or one wheel in the front. I bought my MP3 400ie as I saw a video of an emergency stop using MP3 and the back wheel was lifted up and then down, so I though the MP3 would be more stable, but after purchasing it and riding it, and been exposed to many experiences, it behaved as one wheel in the front. I am not trying to down this scooter, I enjoyed it and I don't regret buying it, but if I knew what I know now, and go back in time, I would not buy it. It is a nice ride but it is heavy comparing to other similar size engine scooters.